<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<my-search :bgcolor="'pink'" @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧的滚动视图区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}"> 	
				<block v-for="(item, i) in cateList" :key="i">
					<view @click="activeChanged(i)" :class="['left-scroll-view-item', i===active ? 'active' : '']">{{item.cat_name}}</view>
				</block>

			</scroll-view>
			<!-- 右侧的滚动视图区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">
						/ {{item2.cat_name}} /
					</view>
					<!-- 当前二级分类下的三级列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的ITEM项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon" ></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
		
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				wh:0,
				cateList:[],
				active: 0,
				//二级分类的列表
				cateLevel2:[],
				scrollTop: 0
			};
		},
		onLoad() {
			//获取当前系统信息
			const sysInfo= uni.getSystemInfoSync()
			//// 为 wh 窗口可用高度动态赋值
			this.wh= sysInfo.windowHeight - 50
			
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const { data: res } = await uni.$http.get('/api/public/v1/categories')
				 if (res.meta.status !== 200) return uni.$showMsg()
				 this.cateList= res.message
				 //为二级分类赋值
				 this.cateLevel2= res.message[0].children
			},
			activeChanged(i) {
				this.active = i
				// 为二级分类列表重新赋值
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			//点击跳转到列表页面
			gotoGoodsList(item3) {
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			gotoSearch() {
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
		
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
	
	.left-scroll-view{
		width: 120px;
		
		.left-scroll-view-item{
			line-height: 60px;
			background-color: #f7f7f7;
			text-align: center;
			font-size: 12px;
			
			&.active {
				background-color: #FFFFFF;
				position: relative;
				
				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}
			}
		}
	}
}
.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
